net/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash()

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Summary

CVECVE-2026-43238
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:44 UTC
Updated2026-05-12 18:54:31 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash() Commit 38a6f0865796 ("net: sched: support hash selecting tx queue") added SKBEDIT_F_TXQ_SKBHASH support. The inclusive range size is computed as: mapping_mod = queue_mapping_max - queue_mapping + 1; The range size can be 65536 when the requested range covers all possible u16 queue IDs (e.g. queue_mapping=0 and queue_mapping_max=U16_MAX). That value cannot be represented in a u16 and previously wrapped to 0, so tcf_skbedit_hash() could trigger a divide-by-zero: queue_mapping += skb_get_hash(skb) % params->mapping_mod; Compute mapping_mod in a wider type and reject ranges larger than U16_MAX to prevent params->mapping_mod from becoming 0 and avoid the crash.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-369

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 38a6f0865796e26fc38fff4858f681d9ae76fa0f 59809fda4da7730cfe84a948033f47eb45db073d git Not specified
CNA Linux Linux affected 38a6f0865796e26fc38fff4858f681d9ae76fa0f 9c735a7d98c982a786b0db71eb6566ee00aaa04f git Not specified
CNA Linux Linux affected 38a6f0865796e26fc38fff4858f681d9ae76fa0f 015cebdfcb97b5347fb7f598ea712a281cb35840 git Not specified
CNA Linux Linux affected 38a6f0865796e26fc38fff4858f681d9ae76fa0f 4ece5eb4836f8ff03b9004dc2430a7169f282851 git Not specified
CNA Linux Linux affected 38a6f0865796e26fc38fff4858f681d9ae76fa0f 3c2b95b26860bd6f8e2310d31ea1200d3f8f173e git Not specified
CNA Linux Linux affected 38a6f0865796e26fc38fff4858f681d9ae76fa0f be054cc66f739a9ba615dba9012a07fab8e7dd6f git Not specified
CNA Linux Linux affected 5.19 Not specified
CNA Linux Linux unaffected 5.19 semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.16 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.6 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/be054cc66f739a9ba615dba9012a07fab8e7dd6f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3c2b95b26860bd6f8e2310d31ea1200d3f8f173e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/59809fda4da7730cfe84a948033f47eb45db073d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4ece5eb4836f8ff03b9004dc2430a7169f282851 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/015cebdfcb97b5347fb7f598ea712a281cb35840 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9c735a7d98c982a786b0db71eb6566ee00aaa04f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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